Abstract
Objective
It is unclear to what extent the increased risk of colorectal cancer in individuals with a family history of colorectal cancer and no known genetic disorders is associated with a higher adenoma prevalence. Our aim is to estimate the relative difference in adenoma prevalence and its age-pattern in individuals with a family history of colorectal cancer compared to those without.
Methods
We performed a literature search to identify colonoscopy studies reporting the adenoma prevalence by age. Using multilevel logistic regression, we examined how the adenoma prevalence by age differed between individuals with and without a family history of colorectal cancer. We excluded members of families with a known genetic disorder.
Results
Thirteen colonoscopy studies were identified. The adenoma prevalence was significantly higher in individuals with a family history than in those without (OR 1.7, 95% CI 1.4–3.5). The adenoma prevalence increased with age (OR per year of age 1.06, 95% CI 1.05–1.07). The age trend did not differ significantly between the two groups.
Conclusion
Individuals with a family history of colorectal cancer have a considerably higher prevalence of adenomas compared to individuals without a family history. This is consistent with their increased risk of colorectal cancer.
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Acknowledgments
This research was funded by National Cancer Institute and National Human Genome Research Institute (jointly) 5 R01 CA114794
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Appendices
Appendix 1: Search strategy Pubmed
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1.
Age [tw]
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2.
Polyp [tw]
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3.
Polyps [tw]
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4.
Adenoma [mesh]
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5.
Adenom*[tw]
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6.
2 or 3 or 4 or 5
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7.
Colon [tw]
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8.
Colonic [tw]
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9.
Colorect*[tw]
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10.
Rectum [tw]
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11.
Rectal [tw]
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12.
7 or 8 or 9 or 10 or 11
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13.
Prevalence [tw]
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Risk [mesh]
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15.
Risk [tw]
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16.
13 or 14 or 15
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17.
Colonoscopy [mesh]
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18.
Colonoscopy [tw]
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19.
19 17 or 18
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20.
1 and 6 and 12 and 16 and 19
Appendix 2
See Table 3.
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Wilschut, J.A., Habbema, J.D.F., Ramsey, S.D. et al. Increased risk of adenomas in individuals with a family history of colorectal cancer: results of a meta-analysis. Cancer Causes Control 21, 2287–2293 (2010). https://doi.org/10.1007/s10552-010-9654-y
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DOI: https://doi.org/10.1007/s10552-010-9654-y